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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eacde63d4f913e8564b64398f4b57e62a4b092bdcf2e779fb359ecfbac4a81d2' 
  AND token = 'DWraaHy7jMhR74EM8zv5XapMs5+lCxdMXEW2VJ60uAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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