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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'febf4f6ba423bb9f519b2b5223218e8012e2ac128beb66cc43351a200c4e969f' 
  AND token = 'RQQEpf671d4Nv683H9grp6ytnmDiaDaxwy/kV7u1XWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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