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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a71ed31ae782c8ee696a22e35891e4af801b5a12b3ea1c88a3d75620996fb4f7' 
  AND token = 'WPm545d0AEb+XAmxC79Xnzf7+g8K34JbiEOXs8GbyVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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