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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d9333b845aa177c4c983c9326010919d9eed4961db79c9e5b8ac3f698f113b0' 
  AND token = 'LqpmL80+/RV3ccB0Ladki49CTpBJuQXQvd4zKg/HCxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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