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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ab5f3c298998cac3443e086d70d27773450052386b2b715283c3ee2d6c2b81' 
  AND token = 'MTCr0YbbiI2htMPcUH6RGWKkOjZO6IqEugHVW4WNQ6Y=' 
  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"
    }
  }
}