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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a0a30cb4e2f85e92115ce02dd742f093c7e60769a8a219df249fe94a5971e55' 
  AND token = 'GpcTxuNfJjow8545ufvND03Ju0QlHqXw2lRV/3m6R5g=' 
  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"
    }
  }
}