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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '390fe641c4ef899db6253745de22dd7b02f40a0f20cf9ef124a8bfcf5c5916ad' 
  AND token = 'QNJyxX6S/lEIIv8DF7e2ASqKuT2MHJos7l3d19HU7X0=' 
  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"
    }
  }
}