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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e32461ac6fa8a915993e0277b6629a7f2bfba5b3bc82cee6871bf26e7e354fbc' 
  AND token = 'hBD6D5/F7ppCspjWv3w2ybbq3U6Dzp4KWWAnAHu5B1U=' 
  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"
    }
  }
}