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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8172221ce4647553600167b5d4fd8e953123e517016281aba98009aeda642785' 
  AND token = 'suiSxzmHUsmcJMIU6RluKRhLD6hkIpn2c/hJulYWPKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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