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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb920c14b4c23a952d7b61ac997286e9e152fae73af091e3cec3f72efa46ec35' 
  AND token = 'Y45PWus6Z1tpEsDrw0v5kpwRqMo/q2eLdxyxkUydofU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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