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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e630ee02fdb863dec87adb2fdebb170bec0629efa13c11f5a835a474d7ae0bc8' 
  AND token = 'BumracBCtE6Qvp0fVx2MKX5i6GbnpcG0RZJp7IJQoUE=' 
  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"
    }
  }
}