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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49419f780851469b409e3ce5361c77e2df10919d79b7533a1ea9dcb8ae42621a' 
  AND token = 'h491ey0FQI7ZlNWK75ZhA3JhVsDEmsPSkfkRRSQ2PLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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