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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cfd13df47cc853e67a4c8db0fe54c4817f23cfd74bb1f74b5de9b599d1fb0f9' 
  AND token = 'PsK1hJ3/U7cI4j/yiO+ahkLVlLr5S04mEcuuv7cm8nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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