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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae518a4bc566ccfba081326812bd647fa941d623d5425df9e7d5954e997d5caf' 
  AND token = 'lJrB/SfywdGZ66W2uj3WZyPPoM2BQ73LX2p0tkiWWuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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