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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e029f70fa42c155e405972bdd8a1f3fa008a02df7786c966f7b172151c25e92f' 
  AND token = 'WGHbpUdnj32o6zFWrQz45uMyZd2/IQDIfYTQ596xCuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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