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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23ce8a9a8152736e38b0741c5f1db95e4bb64be4004afa5e2ed9beb3212d4a4a' 
  AND token = '33mubWuk+le838GCAE1ODBGDvJBXfPCNLAwm5lUhY0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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