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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '866382102277b317e6d5b73bd21c116cef0a55912daeb83d36b8b6b2eee18a2a' 
  AND token = 'GRhfo+R42IxfLSuWPzr9zzriQFilYD6aCTowa8bp/TU=' 
  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"
    }
  }
}