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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56733f61f37cba11d1b06f3086f8a6f3c2e85461cbd4ef08827dc44421a7f18b' 
  AND token = 'Hvcn5lcr6yt4dm8KsB4d2QEtg7KLddnJWZ3v7hcKGf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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