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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '178360822653d065c371b9a669bf49d4aa81cab2a935c9409fddf8dc34e2fec5' 
  AND token = 'LXvOZJKDrfFqxETUiAlJ53zcnv9MElye/Rvy5ZBPbW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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