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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5b30438cc7e2ea6e4760e0c001f82366a1f626c758125864cddbc0c04121728' 
  AND token = 'gr8TQEpGx15wlGi8aQ24AR0FDUL+N+WNyC+XimuqaiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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