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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20c4058bd609f1de228a84e1630ec75e78aced87dc4f08e6c2678580fca56837' 
  AND token = 'y5GlniDlHyTEMPoAArmBu+s7Bm5ddkdWY8ynGmlyWow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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