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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2efba0857859f553759ec42734f33485ef767d866fd4301af4a7f2f3c751be34' 
  AND token = 'Xy+YlpsPUFyGTXlyvNmTmda+pNVr/4kOPaSa5SBSwSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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