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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb2519ee39203b560a6488b22eec1a411c920a06815762cd9fe987f1afeda365' 
  AND token = 'CJw4WrzdN6dPeeEycuF7pJhKp/ggwZsyssxUK3J0R2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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