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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87f9fe82061094cb12a1f1fbc6718ce7fda538bd1bee6edffbceeb96a4be0303' 
  AND token = 'rsH3JNPMgUucDzCkUDCm8OlZCP58QEQDuEHmviEte1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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