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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '570e9ca0f4fdba06c6d584f24dea18aa4724b241f812adf60030472ba8cfb24f' 
  AND token = 'hGLvpENZXQKeBas4NtKMIbdrcILn7UkEI4j4xtbm1HU=' 
  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"
    }
  }
}