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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '664c68121ead570b5bbad6741be8ae447821e199eeb4bb7caf2453ac82173fff' 
  AND token = 'UMmJoYrF8JWrES/cf/ZHHXXoU5HhVAlgN1gtcS0u3Rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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