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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d8b0a84445df7812b913480a712e4c1ce0ee8f30baa7aaf28aae8c39c109388' 
  AND token = '1naE8JzdkeMh5UZWTsdaz4n5+8elVsGJ50U6M24Qu7Y=' 
  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"
    }
  }
}