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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59117c6d3703d44a05c0e98d190b38ea054f4afb95bd315be18d2b8c731bb6d2' 
  AND token = 'WmciNdN4472zSv3Faluh2ZVbpJVZsTHnhInO7SE8SXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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