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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2040bc0f08a85ff9de3df5527c0c8cf170e19277b00a0c170f737e50a021e33' 
  AND token = 'WznVom/iJUdp6YGV/r7CdJLwDxuDWpA7x+ReTMj03uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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