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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84ca3c08e5651a56a35c236fe63fd954241eb6be26eb3dd7af163e3100665547' 
  AND token = 'fnyST5Tde0GJSM6FChZujMHlwq2jp26tjuxsXb40Rsw=' 
  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"
    }
  }
}