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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '861bcc46c21c5c7447f79b2f158bf7bb507cebf18fd0c4545d3580e33119443d' 
  AND token = 'j+YO2uyn+T4C5355WDj8eSVlXUo3ZJthfsqcRJZI1qA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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