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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd95daed84d8b97eb464dd3d1a9a63fa38499e640846d979d63f62b99f54d257e' 
  AND token = 'uIqq8dBI3QFK487yyx/pfo1YeBnYDTx+177szD9b3iI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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