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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ae81ebca881fa3f1ac1d4acf13af4f4221319b2d443edb19994860a83b01685' 
  AND token = 'vnfJTHazo5z5oj/rPCmu9XQs/5T2hN8tKSPCFB+hLFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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