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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6569080b08d9703fec87416487fe4a51a4b9ac67be3a60ec4e5188ea373044b8' 
  AND token = '5tKd7bkV5fzEE+JM+7bvC1hE0kjSgohO+q+XHU4l0Tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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