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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a070bb6aa5dcc6b4caf9391044e7b145ec6cfd9afa5ad860ff32ecc76faa7670' 
  AND token = '2q+GiCAthZGurWZ5d3fsv79iVw11RjDeqIaqkdxBdfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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