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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a5b4893a0365b98e993e990f89f10df70f47216daf84230c0b063c5b75c73d6' 
  AND token = '7WqZq+sXtsqcfXaUJU/ee+GH9/sHh+SD2tjdcovrDgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}