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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23a0694b27a92b10479752a0c235a4bd8c2c20361165bcf06b0fa82050c6192b' 
  AND token = '52wShD0WZZHEic6QJBCsfYI7jaRbDOOZ2bWLhmj5W0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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