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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e5c78386960651b1e886c3ca845fcb22bd640fc8203f0d2f1be71f99ee072c7' 
  AND token = 'D+FNDKvRJR/qh89Bz7eyDQJ5M8m43J7sfWnAf+Dd3sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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