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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71a16979d264ba9139e85dd0a4ea341d691786e7f7d6b02d3854d66efe0f77d7' 
  AND token = '7quUS8Og51oXoZTv9fg8gj1ZE3fkAZX6sYYHbvYMdKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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