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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dde0919ab4e1e7c0e07d334fb38ba1930a13988c55dd3b501e98c12ad874fd5a' 
  AND token = 'idieVoFwkbJj6svWGg3o334XRveYNL9p9j7pxvwqoXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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