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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c1524a22ed881e6e9bd54782c989ac51982d7aad86e5c58ef29e1163c30bd4e' 
  AND token = 'jgT0nqyGlstpJV7fnturSuTLa852v115F2zF9pfMR9g=' 
  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"
    }
  }
}