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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e455f30d50f12c47cb5be49d02362dc724991a25a68ee52f3d69b8d8144b871f' 
  AND token = 'Afqa8yKfv68YzKtuKmfb39nOxyhaRs7NNUI3YxhhxvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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