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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0a3e98c29b8edfb648f28b675a06f751d8c95c985e338372bcc2ad392ef10c0' 
  AND token = 'XU1x8Uya2tpJdyEwBo6bbpR6l8+NvOFnJi4rCEU0DPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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