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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fe9a3cc6d960b55c10f49a98ac984c86ef139738cc056c31f17d1dc086f2514' 
  AND token = 'FEPOc5g/ATKUkAG8BXFRokEGZZu799+aHRCfs1vjaXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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