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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ca23f6e74c855986394ac0abe89071598ac7a0e3c7b931da12fe509cffff1e7' 
  AND token = 'VdZ52zK7E1TPeV54/tVKvfQsAHOG9Qdd4WGODOdZc7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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