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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93deaaf1bd7dee7abce3ab7ed9a6d0240d8a1fba192c910fdcd174865c1c878d' 
  AND token = 'ClM1hvPa2p6AHKz+19CSBiu3D7bX26MLy14rKJLKPFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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