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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b42c3cb295a4999ad9310ba7d8220a6474e8e7c9a84a6e579e43afb4aab4305' 
  AND token = 'Bwe29+xdHgqEDOU6nQxBJrIxFlvJN6558LMPvjiGuQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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