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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39c257872ba948ca91265858e2f9b035030df0290abef33219d0072dde6bed28' 
  AND token = '8D0qB2gsdUIwj+AQYoI8l1rsNuzLyzNN+9Lx9tjp7iI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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