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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e047a688f70c3a2e73f0ef114946f46560f00db3c2aa0e3bc9f42030ce882ddb' 
  AND token = 'e8f+eyaTRaugAG4c9Lt17ehAH5MziKsPbHdHpfP7niU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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