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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0799ae49382b6d7cbe66cebbc345d21e50157f28f65b41b6fc75b6b33dd1b870' 
  AND token = 'nY7UH2nGZcBnzXqC1YbuHkRjNqU9dORGSNX1zW5GnEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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