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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e30c4c49ac4d1a046bde633bf136e7ec9067ca5dc9b2afa8e1ce18c9342e4ed6' 
  AND token = 'ycdy1/FJbCcHJNfDZyz+GoUGZaBcbGiEx/du5L2NH6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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