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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e14b8a9ef98f4cb09b1426ba864dd36897d061c8752cf32511a6b090019d2711' 
  AND token = 'BSsJKsM+IxnFKy4woXnMWLkjM2SFv2RGuIG1BykM+aM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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