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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df1f088b63f798ff6217a78a9c1a2d39ec9d73b38121b09915a92736c4fdd862' 
  AND token = 'xYo9d7qC5S089fCSZbE4SFLKn6onMlH81PUVrC4GfL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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