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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad4fbb5d459408bc1a4086edc66dd59f565768672981674e1d3f09b2e4dc5fbd' 
  AND token = 'aN9U/kDK1zxVDiCI4sbkIS5qfIi5uXyRBNNblvkBwgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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