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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29f32bf893e11b682f869c9d3be399d6b4de46b1796042163a83cec2c92485db' 
  AND token = 'szmmswh4H7OkzSHotCHeyTVh/N+jNQ0QmLB6hKqT8F8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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